insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:36:24: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
36 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:38:20: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
38 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:43:20: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
43 | if(S.size()==k*mid) {
| ~~~~~~~~^~~~~~~
insects.cpp:56:32: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
56 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:58:28: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
58 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:88:32: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
88 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:90:28: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
90 | if(S.size()==k*mid) break;
| ~~~~~~~~^~~~~~~
insects.cpp:9:12: warning: unused variable 'j' [-Wunused-variable]
9 | int i, j;
| ^